The Clinical Value Of Ultrasound Diagnosis In Deep Venous Thrombosis Of Lower Extremities

Objective: To evaluate the clinical significance of ultrasound diagnosis in deep venous thrombosis of lower extremities .Methods: To observe ultrasonic images and hemodynamic changes at each different stage of DVT by ultrasound .Sixty-one patients suspected as acute deep venous thrombosis were examined by ultrasound. 2DUS was used to detect the venous diameter, echoes, and thromboplastic scopes. CDFI and PW were used to detect blood flow, spectrum pattern, blood velocity and venous valvular function .All these cases were followed up after five weeks and half of a year . CFV, SFV, POV, etc were assessed by pressure detector examination ,Valsalva test and the action of pressing leg terminal.Results: In the first consulting test sixty-one patients suffered vascular diameter became wider than the normal side clearly(P<0.01) .There were no color blood flow sign in vascular cavity being all blocked.In vascular cavity being partly blocked ,there was pulsing Doppler detecting successive blood flow spectrum with low velocity at the segment being thrombosis partly, which changed little according to respiration or not. After five weeks treatment, the thrombosic echoes were enhanced and the suffered vascular diameter became smaller but not obvious (P>0.05). There was partly recanalization of some thrombi and there were abnormal strip branchful color blood flow signs at recanalization point , the blood flow margin was not tidy ,and there was no apprecibly developed collateral circulation. After six months: The thrombosic echoes were more enhanced, the suffered vascular cavity became smaller obviously than normal (p<0.01).There was locally or dispreadingly thicked at which parts.There were color blood flow signs in recanalizating venous and the spectrums were low velocity and consecutive.In the wholly recanalizating venous the spectrum could change according to following respiration, but the blood flow velocity of suffered venous was lower than the control side(P<0.05),and there were developed collateral circulation and venous valvular reflux at some degree.Conclusion:There were characteristic ultrasonic images and hemodynamic changes at each different stage of DVT. By means of them we can recognize the course of clinical treament and know the thrombosis sequela. This is of very important clinical significance.